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Vortex liquid entanglement in irradiated YBa_2Cu_3O_7 thin films

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Sefrioui, Zouhair and Arias, D. and González Herrera, Elvira María and León, C. and Santamaría Sánchez-Barriga, Jacobo and Vicent López, José Luis (2001) Vortex liquid entanglement in irradiated YBa_2Cu_3O_7 thin films. Physical review B, 63 (6). ISSN 1098-0121

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Official URL: http://dx.doi.org/10.1103/PhysRevB.63.064503


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Abstract

Epitaxial YBa_2Cu_3O_7 thin films, grown by high-pressure de sputtering, an irradiated with He^(+) ions at 80 keV with doses between 10_(14) and 10_(15) cm^(-2). Irradiation reduces the critical temperature but it does not modify the carrier concentration. Angle- dependent resistivity is used to show that the mass anisotropy does not change upon irradiation. The melting transition in magnetic fields applied parallel to the c axis is analyzed by I-V critical scaling, and all irradiated and nonirradiated samples show a three- dimensional vortex glass transition with the same critical exponents. The dissipation in the liquid state is analyzed in terms of the activation energy of the magnetoresistance in a perpendicular magnetic field. While as-grown samples show an activation energy depending as 1/H on the applied magnetic field, irradiated samples show a dependence as 1/H^(0.5), characteristic of plastic deformation of vortices. This is discussed in terms of the point disorder introduced by ion irradiation.


Item Type:Article
Additional Information:

©2001 The American Physical Society.
Financial support from CICYT Grant Nos. MAT94-0604, MAT97-0675, and MAT99-1706E is acknowledged. Z.S. thanks AECI for financial support.

Uncontrolled Keywords:High-temperature Superconductors; High-tc superconductors; Lattice-melting transition; Flux-line-lattice; II Superconductors; Quenched disorder; Phase-transitions; Glass-transition; Single-crystals; Elastic theory
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electromagnetism
Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:43897
Deposited On:22 Aug 2017 17:12
Last Modified:10 Dec 2018 14:58

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